METRObility Optical Systems 2131-13-01 Operation manual

Installation & User Guide
Models: 2131-13-01 / 2131-14-01 / 2131-15-01 / 2131-16-01 /
2131-17-01 / 2131-1J-01 / 2131-1X-01 / 2131-1Y-01
“twister”™ 2131
100Mbps TX-to-FX
Media Converter
TX RXMM
PWR
100BASE-FX 100BASE-TX
™
“twister” 2131
LKAT LKAT
TX RXMM
PWR
100BASE-FX 100BASE-TX
™
“twister” 2131
LKAT LKAT
TX RXSM
PWR
100BASE-FX 100BASE-TX
™
“twister” 2131
LKAT LKAT
TX RXSM
PWR
100BASE-FX 100BASE-TX
™
“twister” 2131
LKAT LKAT
TX RXSM (LH)
PWR
100BASE-FX 100BASE-TX
™
“twister” 2131
LKAT LKAT BWDM
PWR
100BASE-FX 100BASE-TX
™
“twister” 2131
LKAT LKAT

This publication is protected by the copyright laws of the United States and other countries, with all rights
reserved. No part of this publication may be reproduced, stored in a retrieval system, translated, transcribed,
or transmitted, in any form, or by any means manual, electric, electronic, electromagnetic, mechanical,
chemical, optical or otherwise, without prior explicit written permission of Metrobility Optical Systems, Inc.
© 2002 Metrobility Optical Systems, Inc. All rights reserved. Printed in USA.
Metrobility Media Converters
100Mbps Standalone Units:
2131-13-01 ____ TX to FX multimode SC; universal AC
2131-14-01 ____ TX to FX singlemode SC; universal AC
2131-15-01 ____ TX to FX multimode ST; universal AC
2131-16-01 ____ TX to FX singlemode ST; universal AC
2131-17-01 ____ TX to FX singlemode SC (40km); universal AC
2131-1J-01 ____ TX to FX singlemode SC (100km); universal AC
2131-1X-01 ____ TX to FX singlemode 1550/1310nm bidirectional wave-
length division multiplexed (BWDM) SC
2131-1Y-01 ____ TX to singlemode 1310/1550nm BWDM SC
2131-34-01 ____ FX multimode SC to FX singlemode SC; universal AC
2131-36-01 ____ FX multimode SC to FX singlemode ST; universal AC
2131-54-01 ____ FX multimode ST to FX singlemode SC; universal AC
2131-56-01 ____ FX multimode ST to FX singlemode ST; universal AC
10Mbps Standalone Units:
2111-12-01 ____ RJ-45 to BNC; universal AC
2111-12-02 ____ RJ-45 to BNC; domestic AC
2111-13-01 ____ RJ-45 to FL multimode SC; universalAC
2111-13-02 ____ RJ-45 to FL multimode SC; domesticAC
2111-15-01 ____ RJ-45 to FL multimode ST; universal AC
2111-15-02 ____ RJ-45 to FL multimode ST; domestic AC
2111-16-01 ____ RJ-45 to FL singlemode ST; universal AC
2111-16-02 ____ RJ-45 to FL singlemode ST; domestic AC
2111-18-01 ____ RJ-45 to FL multimode SMA; universalAC
2111-18-02 ____ RJ-45 to FL multimode SMA; domesticAC

Table of Contents
“twister” 2131 100Mbps TX-to-FX Media Converter Installation & User
Guide
Introduction ............................................................................................................... 4
Overview .................................................................................................................... 5
Installation Guide ...................................................................................................... 6
STEP 1: Unpack the “twister” and Accessories ........................................... 6
STEP 2: Choose an Appropriate Location ................................................... 6
STEP 3: Set the Switches ............................................................................. 7
STEP 4: Connect to the Network ................................................................. 9
STEP 5: Apply Power ................................................................................ 10
User Guide ............................................................................................................... 12
System LEDs.............................................................................................. 12
Link Loss Carry Forward (LLCF) ............................................................. 13
Topology Solutions .................................................................................... 14
Technical Specifications............................................................................. 16
Product Safety, EMC and Compliance Statements .................................... 18
Warranty and Servicing .............................................................................. 19
Metrobility Optical Systems, the Metrobility Optical Systems logo, and “twister” are trademarks of Metrobility
Optical Systems, Inc.All others are trademarks of their respective owners.
The information contained in this document is assumed to be correct and current. The manufacturer is not
responsible for errors or omissions and reserves the right to change specifications at any time without notice.

4
Introduction
Thank you for choosing the Metrobility 2131 media converter.
Metrobility 2131 media converters represent the hottest technology available for
extending Ethernet and Fast Ethernet networks. Since Metrobility first developed
“twister” media conversion, it has become a standard for providing a cost-effective
means of integrating a mixed media environment. As LANs grow and evolve, this
technology provides an ideal solution for building effective migration strategies.
These IEEE 802.3u compliant media converters are compatible with Fast Ethernet
devices from other leading network technology providers. This increases the flexibil-
ity of your network configuration by ensuring reliable data transmission in multi-
vendor as well as mixed media environments.
The information in this guide will help you to install and start using your 2131 media
converter.

“twister” 2131 Media Converter 5
Overview
The Metrobility 2131 100Mbps TX-to-FX media converter provides seamless
high-speed integration of 100BASE-TX twisted-pair and 100BASE-FX fiber optic
segments in Fast Ethernet environments. The 2131 supports remote fiber optic links
up to 2km over multimode and up to 100km over singlemode fiber optic cable.
To optimize your Fast Ethernet network, this innovative media converter provides
seamless operation in half-duplex or full-duplex environments. Full signal restora-
tion —with a low bit delay — ensures accurate data transmission to and from LANs
within an organization. All signal activity is completely converted ensuring accurate
communication and collision detection in connected segments and allowing maxi-
mum media length to be achieved on either side of the device.
The Metrobility 2131 provides the following key features:
• A Link Loss Carry Forward (LLCF) enable/disable switch is included
to provide an easy means for troubleshooting a remote network
connection. Refer to the section of this guide titled “Link Loss Carry
Forward” for more information.
• All twisted-pair ports are equipped with an MDI-II to MDI-X switch
eliminating the need for crossover cables.
• Auto polarity support on all twisted-pair ports.
Whether you are updating or expanding your existing network, the Metrobility line
of media converters supports a wide range of configuration needs. The 2131 includes
the following media conversion combinations:
2131-13-01 TX to FX multimode SC
2131-14-01 TX to FX singlemode SC
2131-15-01 TX to FX multimode ST
2131-16-01 TX to FX singlemode ST
2131-17-01 TX to FX singlemode SC (40km)
2131-1J-01 TX to FX singlemode SC (100km)
2131-1X-01 TX to FX singlemode 1550/1310nm BWDM SC
2131-1Y-01 TX to FX singlemode 1310/1550nm BWDM SC

6 Installation Guide
2
Installation Guide
Follow the simple steps outlined in this section of the guide to install and start
using your Metrobility 2131 media converter.
Unpack the “twister” Media Converter and Accessories
Check that the following components have been included with your order:
• 2131 media converter
• Power supply
• Power cord
• Four (4) rubber feet
Your order has been provided with the safest possible packaging, but
shipping damage does occasionally occur. Inspect your order carefully. If
you discover any shipping damage, notify the carrier and follow their
instructions for damage and claims. Save the original shipping carton if
return or storage of the unit is necessary.
Choose an Appropriate Location
The 2131 media converter is intended for use in either office or industrial
environments. The unit must be located within six (6) feet of the AC power
source being used and placed as far away as possible from electrical noise
generating equipment such as copiers, electrostatic printers and other
motorized equipment. If exposed twisted-pair wiring is used nearby, the
wiring should be routed as far away as possible from power cords and data
cables to minimize interference.
The units may be oriented in any manner which permits you to make
physical connection to the power supply and leaves a minimum of six (6)
inches of space for proper ventilation.
TUV Compliance Note: For pluggable equipment, the socket outlet must be
installed near the equipment and be easily accessible.
Bei Geräten mit Steckanschluß muß die Steckdose nahe dem Gerät
angebracht und leicht zugänglich sein.
1

“twister” 2131 Media Converter 7
Set the Switches
Link Loss Carry Forward (LLCF) Switch
The 2131 media converter incorporates Link Loss Carry Forward (LLCF)
functionality as an aid in troubleshooting a remote connection.
A switch for enabling/disabling LLCF is located on the rear panel of the
converter. When LLCF is enabled, the FX ports as well as the TX ports on
the media converter do not transmit a link signal until they receive a link
signal from the opposite port. Refer to the page titled “Link Loss Carry
Forward” in the User Guide section of this manual for more detailed
information.
The unit is shipped with the LLCF disabled. To reset the LLCF, simply
slide the switch to the appropriate setting.
3
PWR
OFF ON
DC INPUT/5VDC
LLCF
LLCF Switch
(default is OFF)
MDI-II to MDI-X Switch
All 2131 media converters with twisted-pair ports have an MDI-II to MDI-
X switch that eliminates the need for crossover cables. This switch is
located on the bottom of the unit directly below the RJ-45 connector and
allows simple setup in either straight through or crossover configurations.
Refer to the following illustration.

8 Installation Guide
When setting the MDI-II to MDI-X switch, observe the
positioning of the following symbols:
• the parallel symbol (II ) indicates a straight through or parallel
connection. (default)
• the cross symbol (X) indicates a crossover connection.
These symbols are clearly marked on the bottom of the unit. Using a
pointed object, simply slide the switch in the direction of the appropriate
symbol. Use the following table as a guide:
A device that is wired straight through, needs one crossover connection:
If the cable is…
straight through
crossover
…the MDI-II to MDI-X Switch Setting should be
X
II
A device that is wired crossover, needs a parallel connection:
If the cable is…
straight through
crossover
…the MDI-II to MDI-X Switch Setting should be
II
X
TX RX SM
PWR
100BASE-FX 100BASE-TX
™
“twister” 2131
LKAT LKAT
MDI-II / MDI-X Switch
(default is MDI-II)

“twister”2131 Media Converter 9
Connect to the Network
The Metrobility 2131 media converter offers the ease of plug-and-play
installation.
Each 2131 media converter provides one shielded RJ-45 connector and
supports a maximum segment length of 100 meters for Category 5 twisted-
pair.
The 2131 also comes with the following connectors:
• The 2131-13-01 and 2131-15-01 provide one set of FX multimode SC/
ST connectors, respectively, and supports a maximum segment length of
up to 2km for remote links.
• The 2131-14-01 provides one set of FX singlemode SC connectors and
supports a maximum segment length of up to 15km for remote links.
• The 2131-17-01 provides one set of FX singlemode SC connectors and
supports a maximum segment length of up to 40km for remote links.
• The 2131-1J-01 provides one set of FX singlemode SC connectors and
supports a maximum segment length of up to 100km for remote links.
• The 2131-16-01 provides one set of FX singlemode ST connectors and
supports a maximum segment length of up to 15km for remote links.
4
TX RX SM
PWR
100BASE-FX 100BASE-TX
™
“twister”2131
LKAT LKAT
TX RX SM
PWR
100BASE-FX 100BASE-TX
™
“twister”2131
LKAT LKAT

10 Installation Guide
5
• The 2131-1X-01 and 2131-1Y-01 provide one singlemode bidirectional
wavelength division multiplexed (BWDM) SC connector which supports
a maximum segment length of up to 20km for remote links. BWDM
units must always be used in complementary pairs. That is, a-1X model
must be connected to a -1Y. The -1X unit is designed to transmit data at
a wavelength of 1550nm and receive at 1310nm. Correspondingly, the
-1Y unit transmits data at 1310nm and receives at 1550nm.
Metrobility
-1X Model Metrobility
-1Y Model
up to 20km
When making fiber optic connections, be sure that the transmit (TX) port
of the 2131 connects to the receive (RX) port of the connected device; and
be sure that the transmit (TX) port of the connected device connects to the
receive (RX) port of the Metrobility model.
Once power is applied to the unit, correct connectivity can be verified via
the link (LK) LED.
Apply Power
Power is provided to the 2131 unit from the desktop universal power
supply module. This power module is equipped with a S760 hollow-type
plug for insertion into the DC jack located on the back of the 2131 and
standard IEC 320-type AC power receptacle.
When making power connections, it is recommended that the DC power
cord be connected to the DC input jack located on the back of the media
converter before making the AC connection to the outlet. Be sure to seat
the power cord into the strain relief clip to ensure against accidental
disconnection.
Upon receiving power, the 2131 media converter goes into normal
operation mode and automatically provides the appropriate signal transla-
tion between the connected network segments.

“twister”2131 Media Converter 11
Be sure to verify correct segment connectivity via the link (LK) LEDs on
the front of the unit.
If an additional extension cord is used to connect the power module to the
power source, the following guidelines must be followed.
While one end of the AC power cord can be fitted with whatever plug
is standard for the country of operation, the end that connects to the
Metrobility power supply module must have a female plug that fits this
type of AC receptacle.
• AC 115V (NorthAmerican): use a UL-listed and CSA-certified cord
set consisting of a minimum 18 AWG, type SVT or SJT three-
conductor cord, a maximum of 15 feet in length and a parallel blade,
grounding-type attachment plug rated 15A, 125V.
• AC 230V (USA): use a UL-listed cord set consisting of a minimum
No. 18 AWG, type SVT three-conductor cord, a maximum of 15 feet
in length and a Tandem blade grounding-type attachment plug rated
15A, 250V.
• 240V (outside USA): use a cord set consisting of a minimum No. 18
AWG cord and grounding-type attachment plug rated 15A, 250V. The
cord set should have the appropriate safety approvals for the country
in which the 2131 is installed and marked HAR.
PWR
OFF ON
DC INPUT/5VDC
LLCF
Strain Relief Clip

12
User Guide
This section contains more detailed information regarding the operating
features for the 2131 media converter.
System LEDs
The Metrobility 2131 media converter provides LEDs for the visible verification of
unit status and proper functionality as well as aiding in troubleshooting and overall
network diagnosis and management.
LEDs indicate the following:
• PWR (power): the unit is ON and functioning in normal operation mode.
• LK (link; twisted-pair and fiber optic ports): satisfactory link status on the
respective port.
• AT (activity): the port is receiving data.
Once power is applied to the unit, correct connectivity can be verified via the LK
LED.

“twister”2131 Media Converter 13
Management
Station Management Station
Switch/Hub
w/SNMP Switch/Hub w/SNMP
Metrobility
2131 Metrobility
2131
Remote
up to 15km
LED lit = established link LED unlit = no link
Management
Station Management Station
Switch/Hub
w/SNMP Switch/Hub w/SNMP
Metrobility
2131 Metrobility 2131
Broken
Remote
Cable
Trap generated Trap generated
Link Loss Carried
LED lit = established link LED unlit = no link
Link Loss Carry Forward (LLCF)
The Metrobility 2131 has been designed with a LLCF functionfor troubleshooting a
remote connection. The unit is shipped with the LLCF disabled.
When LLCF is enabled, the fiber optic ports as well as the twisted-pair ports on the
2131 media converter do not transmit a link signal until they receive a link signal from
the opposite port. For example, if LLCF is enabled and two 2131 media converters are
connected via a fiber cable with nothing else connected to them, the link (LK) LEDs do
not illuminate. When a valid link is established at the twisted-pair port, a complete
connection is accomplished.
The diagram below shows a typical network configuration using 2131 media
converters for remote connectivity:
If the fiber connection breaks, or the remote device fails, the 2131 media converter
carries that link loss all the way to the switch/hub which generates a trap to the
management station. The administrator can then look at the media converter to
determine the source of the loss.
IMPORTANT: When connecting a 2131 media converter with LLCF enabled to an
auto-negotiating device, force both sides of the configuration to 100Mbps full or half
duplex. This allows the interface media converter to immediately see link pulses and
start passing data.

14 User Guide
Topology Solutions
F/O Links
Twisted-pair Links
100Mbps Switch
2km multimode F/O
15km singlemode F/O
Servers with
100Mbps NICs
Metrobility
2131
Metrobility 2131

“twister”2131 Media Converter 15
Enterprise Switch
100Mbps Switch
2km multimode F/O
Metrobility 2131
Metrobility
2131
Enterprise

16 User Guide
Technical Specifications
Network Connections
Twisted-Pair Interface
Connector _____________________________________ Shielded RJ-45, 8-pin jack
Impedance___________________________________________ 100 Ohms nominal
Signal Level Output (differential) _____________________________ .95 to 1.05V
Signal Level Input _____________________________________ 350mV minimum
Supported Link Length____________________________________________100m
Cable Type ____________________________________________ Category 5 UTP
(EN55024:1998 compliance) ______________________ Category 5 STP
Multimode Fiber Optic Interface
Connector ___________________________________________________ ST or SC
RX Input Sensitivity _______________________________-31 dBm peak minimum
Output Power __________________________ -14 dBm to -23.5 dBm (50/125 µm)
__________________________ -14 dBm to -20 dBm (62.5/125 µm)
Supported Link Length_______________________________ up to 2km full duplex
Cable Type _____________________________ 50/125, 62.5/125, 100/140 µm F/O
Singlemode Fiber Optic Interface
Connector ___________________________________________________ ST or SC
RX Input Sensitivity _______________________________-31 dBm peak minimum
Output Power ______________________________ -8 dBm to -15 dBm (9/125 µm)
Supported Link Length______________________________ up to 15km full duplex
Cable Type _________________________ 8.3/125, 8.7/125, 9/125, 10/125 µm F/O
Singlemode Fiber Optic Interface — long haul distance support
Connector ________________________________________________________ SC
RX Input Sensitivity ___________________________________ -35 dBm minimum
Output Power ________________________________ 0 dBm to -5 dBm (9/125 µm)
Supported Link Length______________________________ up to 40km full duplex
Cable Type _________________________ 8.3/125, 8.7/125, 9/125, 10/125 µm F/O
Singlemode Fiber Optic Interface — extended long haul distance support
Connector ________________________________________________________ SC
Wavelength ___________________________________________________ 1550nm
RX Input Sensitivity ___________________________________ -31 dBm minimum
Output Power _____________________________ 0 dBm to -3.01 dBm (9/125 µm)
Supported Link Length_____________________________ up to 100km full duplex
Cable Type ______________________ 8.3/125, 8.7/125, 9/125, 10/125 µm SM F/O

“twister”2131 Media Converter 17
Singlemode BWDM Fiber Optic Interface
Connector ________________________________________________________ SC
Supported Link Length______________________________ up to 20km full duplex
Cable Type ______________________________________________ 9/125 µm F/O
(2131-1X-01)
TX Wavelength ___________________________________________ 1550 nm
RX Wavelength ___________________________________________ 1310 nm
RX Input Sensitivity _______________________________ -32 dBm minimum
Output Power___________________________ -8 dBm to -15 dBm (9/125 µm)
(2131-1Y-01)
TX Wavelength ___________________________________________ 1310 nm
RX Wavelength ___________________________________________ 1550 nm
RX Input Sensitivity _______________________________ -32 dBm minimum
Output Power___________________________ -8 dBm to -15 dBm (9/125 µm)
Data Rate
Data Rate _________________________________________ 100Mbps half duplex
_________________________________________ 200Mbps full duplex
Bit Delay ___________________________________________________ < 40 bits
Power
Input ____________________________________________ 90-260V AC 50/60 Hz
Output ________________________________________________ +5VDC @ 1.2 A
Environmental
Operating Temperature _______________________________________ 0°to 55°C
Storage Temperature________________________________________-25°to 70°C
Relative Humidity _____________________________ 5% to 95% non-condensing
Physical Case ____________________________ Fully enclosed metal construction
Dimensions __________________________________ 4.83" L x 3.26" W x 1.71" H
____________________________________ 12.3 cm x 8.3 cm x 4.3 cm
Weight (including power supply) ______________________________ 3 lb, 1.36 kg
Regulatory
Compliance______________________ IEEE 802.3u 100BASE-FX, 100BASE-TX,

18 User Guide
Product Safety, EMC and Compliance Statements
This equipment complies with the following requirements:
•UL
• CSA
• EN60950 (safety)
• FCC Part 15, Class A
• EN55022 Class A (emissions)
• EN55024: 1998 (immunity)
• IEEE 802.3u
• IEC 825-1 Classification
• Class 1 Laser Product
• DOC Class A (emissions)
This product shall be handled, stored and disposed of in accordance with all govern-
ing and applicable safety and environmental regulatory agency requirements.
The following FCC and Industry Canada compliance information is applicable to
North American customers only.
USA FCC Radio Frequency Interference Statement
This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses and can
radiate radio frequency energy, and if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interfer-
ence in which case the user will be required to correct the interference at his own
expense.
Caution: Changes or modifications to this equipment not expressly approved by the
party responsible for compliance could void the user’s authority to operate the
equipment.
Canadian Radio Frequency Interference Statement
This Class A digital apparatus meets all requirements of the Canadian Interference-
Causing Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Réglement sur
le matériel brouilleur du Canada.

“twister”2131 Media Converter 19
Warranty and Servicing
Three-Year Warranty for Metrobility “twister” Media Converters
Metrobility Optical Systems, Inc. warrants that every “twister” media converter will
be free from defects in material and workmanship for a period of THREE YEARS.
This warranty covers the original user only and is not transferable. Should the unit
fail at any time during this warranty period, Metrobility will, at its sole discretion,
replace, repair, or refund the purchase price of the product. This warranty is limited
to defects in workmanship and materials and does not cover damage from accident,
acts of God, neglect, contamination, misuse or abnormal conditions of operation or
handling, including overvoltage failures caused by use outside of the product’s
specified rating, or normal wear and tear of mechanical components.
To establish original ownership and provide date of purchase, complete and return
the registration card or register the product online at www.metrobility.com. If
product was not purchased directly from Metrobility, please provide source, invoice
number and date of purchase.
To return a defective product for warranty coverage, contact Metrobility Customer
Service for a return materials authorization (RMA) number. Send the defective
product postage and insurance prepaid to the address provided to you by the
Metrobility Technical Support Representative. Failure to properly protect the product
during shipping may void this warranty. The Metrobility RMAnumber must be
clearly on the outside of the carton to ensure its acceptance.
Metrobility will pay return transportation for product repaired or replaced in-
warranty. Before making any repair not covered by the warranty, Metrobility will
estimate cost and obtain authorization, then invoice for repair and return transporta-
tion. Metrobility reserves the right to charge for all testing and shipping costs
incurred, if test results determine that the unit is without defect.
This warranty constitutes the buyer’s sole remedy. No other warranties, such as
fitness for a particular purpose, are expressed or implied. Under no circumstances
will Metrobility be liable for any damages incurred by the use of this product
including, but not limited to, lost profits, lost savings, and incidental or consequential
damages arising from the use of, or inability to use, this product. Authorized resellers
are not authorized to extend any other warranty on Metrobility’s behalf.

Product Manuals
The most recent version of this manual is available online at
http://www.metrobility.com/support/manuals.htm
To obtain additional copies of this manual, contact your reseller, or call
1.877.526.2278 or 1.603.880.1833
Product Registration
To register your product, go to
http://www.metrobility.com/support/registration.cfm
25 Manchester Street, Merrimack, NH 03054 USA
tel: [phone] • fax: [phone]
www.metrobility.com
5660-213113-001 H
6/02